Gallienus AD 253-268. Antoninianus irregular (BI; 18-20mm; 2.08g; 5h) IMP G[A]LLIENVS Radiate bust of Gallienus to right. Rev. [ ]ERO Standing male figure (Mars) with helmet holding spear in left hand and branch (?) in right; in the field to left, X (?)
mt 1/ 2009 p. 124f. and pl. 17 (this coin illustrated); cf. MIR 36, 627.